Sync local AD passwords to Office 365?

I am reading through a lot of information about Office 365 and AD password sync/dirsync, etc. and getting a tad confused as to the best path to take.

I am looking for the simplest way to have my local AD passwords get synced with Office 365 accounts. I don't care about 2 way sync, just something simple to take my AD passwords and have them overwrite the Office 365 passwords.

thanks
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mvalpredaAsked:
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Cliff GaliherCommented:
There is one (and only one) way to do that. Dirsync.
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mvalpredaAuthor Commented:
Will Dirsync allow me to choose what I want to sync? Do I need to set up AD FS?
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Cliff GaliherCommented:
Dirsync syncs all of the object types and attributes it supports. There is no selective syncing. ADFS does not sync at all. It is a different set of tools to address different scenarios... mainly true single sign-on scenarios when it comes to O365.
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mvalpredaAuthor Commented:
If I have a bunch of old user objects in AD....how will it process those? Or just skip them if the UPN doesn't match anything at O365?
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Cliff GaliherCommented:
They will get synced like everything else. Dirsync does not activate any licenses. It is still up to you to do that. You'll just see a bunch of inactive accounts in O365 after the first sync. It is best to clean up AD before dirsync if you have a bunch of objects not in use.
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mvalpredaAuthor Commented:
If I sync and then clean up AD, will it delete those inactive accounts from O365?

Is it best to have the UPN set up on all my accounts to match email addresses in O365?
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Cliff GaliherCommented:
If you are going to run DirSync, you need to understand how it runs and how to administer it. Read the documentation. Truly. All these questions are answered in there and running it without reading about it is a great way to get yourself in trouble. It is a lot more efficient than playing whack-a-mole with all these questions.
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Vasil Michev (MVP)Commented:
You can configure filtering for dirsync, so that only select object are synced to O365:

http://technet.microsoft.com/en-us/library/jj710171.aspx

Here's also comparison between using dirsync with password sync and AD FS:

http://blogs.office.com/2013/07/26/password-hash-sync-simplifies-user-management-for-office-365/
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PhilonatorownerCommented:
There are four viable options

1.  use Dir Sync with password sync

2. Use ADFS which will federate your domain to the cloud

3. user power shell and set all your user passwords to never change:
Connect-MsolService -cred $cred
Get-MSOLUser | Set-MsolUser -PasswordNeverExpires $true

4. Use a third party tool like:
http://www.messageops.com/software/office-365-tools-and-utilities/office-365-password-synchronization/
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